chore(shorebird_cli): run CI on Windows and Linux

[bryanoltman]

Description

Fixes #1860

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.83%. Comparing base (8309934) to head (551aebd).

Additional details and impacted files

@@             Coverage Diff              @@
##              main    #1873       +/-   ##
============================================
- Coverage   100.00%   87.83%   -12.17%     
============================================
  Files          172      172               
  Lines         5410     5411        +1     
============================================
- Hits          5410     4753      -657     
- Misses           0      658      +658     

Flag	Coverage Δ
artifact_proxy	100.00% <ø> (ø)
discord_gcp_alerts	100.00% <ø> (ø)
jwt	100.00% <ø> (ø)
redis_client	100.00% <ø> (ø)
scoped	100.00% <ø> (ø)
shorebird_cli	84.26% <ø> (-15.74%)	⬇️
shorebird_code_push_client	100.00% <ø> (ø)
shorebird_code_push_protocol	100.00% <ø> (ø)

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